Git Commit Formatter

Git Commit Formatter

Overview

Generate a commit message that matches repository conventions and accurately summarizes code changes. Detect style first, then produce one final message candidate plus optional alternatives only when requested.

Workflow

1. Detect the expected format from repository signals.
2. Summarize the real intent of the change from diffs, not filenames alone.
3. Produce a message with strict structure and length constraints.
4. Validate against local conventions and rewrite once if needed.

Detect Format

Check in this order and follow the first clear signal:

1. .git/COMMIT_EDITMSG recent style (if available)
2. commitlint.config.*, .commitlintrc*, lefthook.yml, .husky/*
3. package.json scripts/tools mentioning commitlint or cz
4. Recent git log --oneline pattern

If no clear convention is detected, default to Conventional Commits.

Build Message

Use this template unless repo rules differ:

type(scope): subject

body

footer

Apply these rules:

• type: choose the smallest accurate type (feat, fix, refactor, docs, test, chore, build, ci, perf, style)
• scope: include only if clear and stable (package/module/domain)
• subject: imperative, present tense, no trailing period, target <= 50 chars
• body: explain why and what changed; wrap around 72 chars
• footer: include BREAKING CHANGE: and issue links when applicable

Mapping Heuristics

Use these defaults when intent is ambiguous:

• Bug correction with behavior change: fix
• New user-visible behavior: feat
• Behavior-preserving cleanup: refactor
• Test-only updates: test
• Tooling/dependency/build-only: chore or build or ci
• Comment/readme/docs-only: docs

Prefer correctness over verbosity. If multiple logical changes are mixed, propose split commits.

Output Contract

Return:

1. Final commit message in a single fenced block.
2. Short rationale (1-3 lines) mapping diff to type/scope.
3. If uncertainty is high, ask one focused question; otherwise choose best default.

Do not include git commands unless explicitly requested.

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